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Mathematics
Mathematics
Problem
Calculate
(
sin
30
∘
cos
60
∘
)
2
+
(
cos
30
∘
sin
60
∘
)
2
−
2
(
sin
45
∘
cos
45
∘
)
\left(\dfrac{\sin30^\circ}{\cos60^\circ}\right)^{2}+\left(\dfrac{\cos30^\circ}{\sin60^\circ}\right)^{2}-2\left(\dfrac{\sin45^\circ}{\cos45^\circ}\right)
(
cos
6
0
∘
sin
3
0
∘
)
2
+
(
sin
6
0
∘
cos
3
0
∘
)
2
−
2
(
cos
4
5
∘
sin
4
5
∘
)
. a)
1
1
1
b)
0
0
0
c)
2
2
2
d)
2
−
2
3
2-2\sqrt3
2
−
2
3
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